Carborundum abrasive article.



No Drawing.

UNITED STATES PATENT OFFICE.

' FRANKJ. TONE, or NIAGARA FALLSQNEW YORK, ASSIGNOR TO THE CARBORUNDUMCOMPANY, OF NIAGARA FALLS, NEW YORK, A CORPORATION OF PENNSYLVANIA.

' cAnnommnum ABRASIVE ARTICLE.

- To all whom it may concern:

7 Be it known that I, FRANK J. TONE, of

' Niagara Falls, Niagara county, New York,

haveinvented a newand useful Carborun-' dum Abrasive Article, of whichthe followin is a full, clear, and exact description.

y invention has relation to carborundum abrasive articles, composed ofcarborundum grains and a vitrified binding material, the novel featureconsisting principally in the character of the binder and its fluxingcn-,

stituents for the purpose pf givin increased strength and better textureto t e formed ceramic bodies.- For the. purpose of introducing thefluxing constituents of the binder, I employ a ,limealkali-bearinmineral, such as pegmavention. l

tite. The (pegmatite commonly used in the ceramic in ustries, is thatknown "as Cornwall stone, but any'pegmatite or other suitablelime-bearing mineral may be used without "departing from the principleof my in- The' following mixture will serve as a 'typical'one toillustrate the manner-0f ro-\ ducingthe article, I :take carborun umwins 78 parts, Cornwall stone 18 parts, aolin 3 parts, flint 1 part.-The carborundum grains may be of any grade of coarseness or fineness,according to the requirements of the article and ,the nature of theabrasive work to be performed'by it, and the bring them to about theconsistency of moldother constituents named are in the ground orowderedform in which they are ordinarily sup lied to the trade. Theseingredients are t oroughl mixed in a dry state, and then moistened withsuflicient water to Specification of Letterslatent. Patented Dec, 13,1910, I ncmon filed April 1, 190a. Serial-1lo, 424,599..

l I ing sand.,. The mixture is then placed in an iron mold of the shapedesired for the finished article, and subjected to heavy pressure. It isthen removed from the mold, dried and .fired in a kiln to a temperatureof about 2500 degrees F. The superiorityof this binder I attribute tothe fact that the soda-limeor potash-lime porcelain formed shows greatertoughness and resistance to \vearthan regular soda and lains Withoutlime.

Certain so-called clays, which are mixtures of kaoliniteand varioussilicates carry a highproportion of lime and of alkali, may

be used to obtain the same or similar oomosition, and the lime in theform of caronate or other compounds may also be used in the mixture toobtain in the ceramic body the s ecial qualities herein described' I 0not confine m self to the use of the potash porce- I the-lime-bearingminerals available for ceramic purposes to accomplish the fusion of thebond and to impart the requisite strength and wearing qualities.

I claim As a new article of manufacture, amolded ceramic body composedof crystalline carborundumand a vitrified binder formed from a mixtureof a lime-bearing material, 'kaolinite and flint.

In testimony whereof, I have hereunto set my hand.

, b I FRANK J. TONE.

Witnesses: CHARLES CHORMANN, 'EoMUN'n' S. SMITH.

